Split tapered die positioning carriage for split tapered dies



Nov. 25, 1958 w. J. ROZMUS 2,861,487

SPLIT TAPEREDDIE POSITIONING CARRIAGE FOR SPLIT TAPERED DIES Filed April 13, 1953 2 Sheets-Sheet 1 I FIG.2

INVENTOR.

@ WALTER J. ROZMUS [S 57, W

Nov. 25-, 1958 w. J. ROZMUS 2,861,487

SPLIT TAPERED DIE POSITIONING CARRIAGE FOR SPLIT TAPERED DIES Filid April 13, 1953 2 Sheets-Sheet 2 FIG.4

FIG. 7

IN VEN TOR. FIG'5 WALTER .1. ROZMUS 3W7 w W 4 2 United States Patent SPLIT TAPERED DIE POSITIONING CARRIAGE FOR SPLIT TAPERED DIES Walter J. Rozmus, Whitesboro, N. Y., assignor, by mesne assignments, to Kelsey-Hayes Company, Detroit, Mich., a corporation of Delaware Application April 13, 1953, Serial No. 348,535

3 Claims. (Cl. 78-82) This invention relates in general to butt welding of longitudinal work pieces in end-to-end relationship, and relates more specifically to novel apparatus for cold welding of metal.

The union of two metallic members by the use of controlled cold flow of the metal structures, is a relatively recent accomplishment insofar as reducing the basic principles to a practical and useable procedure is concerned. It has long been known that metal can flow at room temperature under proper conditions of loading. It is possible that the uniting, or welding, of two metal objects by controlled application of high pressure at room temperature has been known. However, the reduction of this knowledge to a practical level has only recently been accomplished.

Some metals will actually diffuse in such manner that a polished section of the union will not reveal a distinct junction between the two original members. Other metals have a distinct line dividing the original members. It has not definitely been determined what the nature of the union is in this line. It is definitely established, however, that an exceptionally strong union is produced between the two original members whether or not there is an actual diffusion. It is not the concern of the'present invention whether the union is achieved by actual diffusion or some other phenomena of metal union, but rather with the results obtained. Accordingly, in this specification and in the claims, reference will be made to a union between members caused by controlled cold flow of the metal structures, or to a cold weld. It is not intended that this invention should be limited by the choice of words to describe the junction between the members.

Therefore, the object of this invention is to provide opening and control means for a split tapered die residing within a tapered die bed cavity.

Another object of this invention is to provide split tapered dies in a holder for such dies and means for causing the dies to split as they are advanced forward with respect to the holder.

Other objects and a fuller understanding of the invention may be had by referring to the following description and claims, taken in conjunction with the accompanying drawings, in which:

Figure 1 is a perspective view of a hand type tool for cold welding butt joints in wire, the principles of this invention being incorporated in the construction and use thereof;

Figure 2 is a sectional view taken substantially as indicated by line 2-2 of Figure 1;

Figure 3 is a sectional viewtaken along line33 of Figure 2; V

Figure 4. is a top view taken along line 4-4 of Fig ure 2;

Figure 5 is a sectional view taken along line 5-5 of Figure 4;

Figure 7 is a view, similar to Figure 4, of the modification. 7

In the drawings there is represented a hand type tool for cold welding butt joints in a wire. The tool is represented generally by the reference character 10. The principles of the present invention can apply equally well to power driven, hand, and bench types of tool.

The tool 10 has a carriage 11 and a carriage 12. The carriage 11 has a front face wall 14 and the carriage 12 has a front face wall 13. The carriages 11 and 12 are mounted for relative movement toward and away from one another along a fixed path of reciprocation with the front face walls thereof facing one another.

In the embodiment of the invention as the tool 10, the carriage 11 is secured in a fixed position upon a handle 15 for convenience. The handle 15 is provided with a slot 16 similar in many respects to the longitudinal slot of a conventional sliding side jaw wrench. In fact, the carriages 11 and 12 are analogous to the fixed and movable jaw of a conventional sliding side jaw wrench. The carriage 12 is provided with a jaw guide rail or key 17 to fit into the slot 16 and reciprocate longitudinally therein. The carriages 11 and 12 are further aligned with respect to one another by means of .a guide dowel pin 40 which may be carried by one of the carriages and fit slidably into a socket of the other. i

In order to drive the front wall faces 13 and 14 toward one another, a linkage drive mechanism is provided to force the key '17 to move longitudinally in the slot 16. The drive mechanism comprises generally a handle lever 18 pivotally carried at the end by means of a pivot 20 as illustrated best in Figure lot the drawing. A link 19 is pivotally secured to the handle lever 18 by means of a pivot 21, and is pivotally secured to the handle 15 by means of a pivot 22. It can be seen from the illustration in Figure 1 of the drawings that the linkage thus provided affords a fast movement of the carriage 12 toward the carriage 11 during the first portion of the move- 'mounted and the other is reciprocally driven. Accordingly, the construction of carriage 12 and its associated die parts will be explained, and it will be understood that the construction of the carriage and associated die parts of the carriage 11 is substantially identical.

The carriage 12 has a slot 25 running longitudinally thereof with respect to the direction of reciprocation, as best shown in Figure 2 and Figure 5. The slot has a mouth portion 26 and a tapered die bed portion 27. Any particular cross section of the slot 25 will be substantially key-hole shape with a small mouth and a large die bed portion. The tapered die bed portion 27 opens in the front face wall 13 and tapers rearwardly through the carriage 12.

A split die 30 resides within the die bed portion 27 of carriage 12. A similar split die.31 is .provided in the carriage 11. The die 30 is conical in shapeand comprises two sections 32 and 33. The section 32 has a longitudinally extending clamping passageway cavity 34 extending axially along the mating face of the section 32. The section 33 has a similar clamping'passageway cavity extending axially along the mating surface thereof this cavity being indicated by the reference character '35. Together the cavities 34 and 35 define a longitudinal opening through the axis of the conical die 30. The passageway is formed to clamp a round wire of one particular size. However, the cavities can be formed to clamp any shape of work piece including wires having odd shaped surfaces and also including ribbons and similar type work pieces. Any longitudinal member which is to be butt welded on anend of the work piece can be held in suitable clamping cavities within the die 30.

The'tapered die bed 27 and the, split die 30 are of the same taperbut are larger than the taper which would cause a locking of the die within the die bed. However, the tapered fit between the die and the die bed permits .a tight'clamping of the split die upon a work piece to hold the work piece in an excellent gripping action. The more force placed upon the large end of the split die 30 the greater will be its holding action so long as the mating surfaces are not in'actual contact.

The faces of the split dies 30 and 31 are recessed by upset cavities such as cavity 36 on die 30. The form of these cavities can best be seen in Figure 3. These cavities are termed upset cavities although their function is not merely to provide an upset on the end of a work piece, but are designed to produce a cold Weld butt joint according to the principles of such cold welding.

Tapered dies and die bed holders, are not necessarily new but because of the very recent development of practical knowledge concerning cold welding their use has been finding new application. However, whenever a tapered die is employed for the purpose of holding a work piece as the work piece is formed against the surface of the die, there must be a provision for removing the work piece, In the case of joining two longitudinal work pieces inend-to -end butt welded relationship, it is simple enough to insert the work piece through the die from the back end thereof, butit is not possible to withdraw the work piece after the endhas been upset and accordingly, other means for removing the workpiece must be provided. j In the embodiment of the tool as illustrated, provision for removing the Work piece is madeby having the slot with the mouth 26 opening to the surfaceof the carriage. Therefore, by advancing the split die forward out of the tapereddie bed 27, a lateral movement of the sections 32 and 33 can take place to such a degree that the work piece can be lifted out of the die through the mouth 26. a

In modern industry, it is undesirable to require a considerable amount of time and patience on the part of the workman in operating and positioning tool parts entirely by hand. In fact, if the proper positioning of the dies weredone manually, very often the dies would fall out fo'fthe tool or would be improperly returned to operating positionwithin the tool, or both. Therefore, in the present embodiment of the invention, there is provided an improved construction for actuating the dies with respect to the die-holder beds, and causing the two sections of the dies to open for easy removal of work pieces butt welded by the tool 10.

Referring to Figure 3 of the drawing it can be seen that the preferred embodiment of the invention comprises a shuttle cage 41 having a front engagement finger portion 44 extending up and contacting the split die face at the front thereof, and having a back engagement finger 4'5. contacting the rear, or small end of the split die. The shuttle cage 41 is urged rearwardly by means of a spring 46 and therefore constantly" urges the split dies backinto the die bed. The shuttle cage 41 extends under the carriage and is guided by the carriage to a confined longitudinally reciprocal path by means of a guide screw 42. 'A longitudinal slot- 43 in the cage 41 allows the shuttle cage to reciprocatealimited amount with respectjto guide screw 42., a Y

The finger portion 44 serves an additional exceptionally important function of assuring longitudinal alignment of the die sections or each split die, thereby preventing unequal fiash distribution in the welding "operation.

The actualdie opening portion of the device is embodied in die actuating members 47 and 48 which are slidably mounted on the surface of the carriage adjacent to the mouth 26 of slot 25. Die sections 32 and 33 are recessed to provide a longitudinal enlargement of the split interface, as indicated by the reference character 38 in Figures 2 and 5. The members 47 and 48 are provided with the depending side flanges 5 3 and 54 which extend into the slot 38 between the die sections 32 and 33.

Each of the members 47 and 48 are interconnected to the surface of the carriage by a cam and cam follower arrangement which provides a diverging path to separate the members 47 and 48 as they are advanced toward the front face wall 13, and to cause the members to move together as they are retracted. The preferred embodiment of the cam and cam follower arrangement is provided by means of screws 49 and 50 carried by the surface of the carriage .12, and by diverging slots 517 and 52 in the members 47 and 48 respectively. The slots 51 and 52 diverge outwardly, as better shown in Figure 4, and thereby cause a separation of members 47 and 48 upon advancement, andclosing action upon retraction.

As the members 47 and 48 advance and diverge laterally with respect to one another, the side flanges 53 and 54 will spread'the die sections 32 and 33, provided there is sulficient space within the the bed 27. There is assured a sutficient space for separating the die members by linking the shuttle cage 41, the die actuating members 47 and 48, and the split die 30, altogether as a longitudinally shiftable 'unit. The engagement of the split die Miami the shuttlecage has been explained. The die actuating members are provided with front end hooks 55 and 56 respectively, whichiare extended downwardly across the front face wall 13 and engage the front wall of the die 30 on the side thereof opposite from the point engaged by the engagement finger 44 of the shuttle cage 41. At the back of the members 47 and 48 there are provided back hooks 57 and 58, respectively, extending downwardly in a manner similar to theshape of the front hook. I The shuttle cage 41 is provided with fingercontact members 59 and which overlapwith back hooks 57 and 58. H V

As thus described and illustrated, it is apparent that the shuttle cage 41 and the dieactuating members 57 and 58 will reciprocate as a unit and carry the die .30 therealong. Furthermore, upon forward movement of the die 30 out of the die bed 27, the die sections 32 and 33 will be parted to allow ready access from the longitudinal work holdingcavity upwardly through the. mouth 26 of slot ,25. The actuating members47 and 48, and all associated parts therewith will also separate to avoid any blocking of thepassageway to prevent movement of a workpiece upwardly out of the slot 25. Therefore, with respect to the tool illustrated in Figure l the operator can reach around both carriages 11 and 12 with one hand and press gently on the finger contact member 59 and 60 and cause the dies to advance and open. With the other hand, the operator can lift the completed work piece from the tool. V

The Figures 6 and 7 illustrate a modification of the invention. In this modification, the shuttle cage is indicated by reference character '61. The shuttle cage vis similar in most respects to the shuttle cage 41 of Figure 3 in that it is provided with frontv engagement finger 64 and a back engagement finger 65 similar to the fingers 44 and 45 of Figure 3. The carriage is mounted for longitudinal reciprocable drive movement by means of a screw 62 and a spring 66.

However, in the modification shown in these Figures 6' and 7, there is no finger contact member similarto the members 59 and 60 of Figure 3.

Two die'ac'tiiating members 67a'nd 68 very similar in every respect to the die actuating members 47and 48 are provided on the surface of the carriage adjacent: the slot 25, except that these die actuating members 67' "and 68 end at the edge of the carriage. Therefore, they lack the back hook portions 57 and 58 shown in Figure 3. Furthermore, the die actuating members 67 and 68 have no slots and consequently do not provide a cam and cam follower action. In fact, the die actuating members 67 and 68 are secured to the surface of the carriage by means of screws 69 and 70 in a fixed position.

The die actuating members 67 and 68 are provided with side flanges 71 and 72, similar to the flanges 53 and 54, extending down into a suitable slot cut along the mating surfaces between the split die sections. It is the form of these slots which provide the cam and cam follower action. The mating edges of the die sections are grooved along one edge thereof to provide a longitudinal slot 73 having a tapered mouth portion 74 and a parallel slot portion 75. The side flanges 71 and 72 extend down into the mouth portion 74.

Therefore, when the dies are shifted forward by the carriage, the tapered slot 73 cooperates with the flanges 71 and 72 and, therefore, acts as a cam and cam follower to force the die sections apart as they advance.

Although the invention has been described in its" preferred form with a certain degree of particularity, it is understood that the present disclosure of the preferred form has been made only by way of example and that numerous changes in the details of construction and the combination and arrangement of parts may be resorted to without departing from the spirit and the scope of the invention as hereinafter claimed.

What is claimed is:

1. A device for driving the ends of two metal work pieces together under high pressure and confined flow to produce a butt weld union at a temperature less than the thermal weld temperature of the metal, comprising, first and second carriage members, said carriage members each having a front face wall, drive means for forcing said face walls toward one another along a fixed path under high pressure, said first carriage having a tapered die bed cavity opening from said face wall thereof and tapering rearwardly therefrom, said second carriage having a tapered die bed cavity opening from said face wall thereof and tapering rearwardly therefrom, a longitudinal slit in each said carriage opening into said die bed thereof, a first split tapered die in the bed cavity of said first carriage member, a second split tapered die in the bed cavity of said second carriage member, the taper of said split dies and the carriage bed cavities being non-locking, said first split tapered die having a split work piece clamping passageway extending longitudinally therethrough, recessed upset cavity surfaces on the face of said first split dies adjacent said passageway, said second split tapered die having a split work piece clamping passageway extending longitudinally therethrough, recessed upset cavity surfaces on the face of said second split dies adjacent said passageway, said first and second split dies opening laterally with respect to said slit of the carriage, die opening and retaining means for each carriage, each said means including a first and a second longitudinally reciprocable member extending longitudinally along opposite sides of said longitudinal slit, cam track and cam follower surfaces interconnecting each said longitudinally reciprocable member to the carriage, each said cam track and cam follower having an operating path extending toward said carriage face wall and diverging outwardly from the fixed path of said carriage, and interconnecting drive means from each said longitudinally reciprocable member to an adjacent split die portion, whereby movement of the first and second longitudinally reciprocable members toward the carriage face wall will exert alateral opening force on said split dies.

2. A work piece holding and forming tool, comprising, a die holder having a front face and a back face with a tapered die holding cavity opening from said front face and tapering rearwardly therethrough to a smaller opening in said back face, a longitudinal slit opening from said cavity to the surface of the holder, a split tapered die having first and second die parts residing in said die cavity, said die parts meeting in a die interface aligned with said slit, a longitudinally reciprocable die actuating device carried by said die holder, said device having a first and second longitudinal strip laying along the surface of said die holder and a portion extending through said slit and into the interface between said die parts, a first cam track and cam follower means between said first strip and the die holder, second cam track and cam follower means between said second strip and the die holder, said first and second cam tracks and followers defining diverging paths in the direction of said front face of the die holder, said die actuating device having a contact member engaging the small ends of said split tapered die, and spring means urging said die actuation device rearwardly from said front face, whereby driving force on the die actuating device against the urge of said spring will both advance and part said split die.

3. A work piece holding and forming tool, comprising, a die holder having a front face with a tapered die holding cavity opening from said front face and tapering rearwardly therefrom, a longitudinal slit opening from said cavity to the surface of the holder, a split tapered die having first and second die parts residing in said die cavity, said die parts meeting in a die interface aligned with said slit, a longitudinally reciprocable die actuating device carried by said die holder, said device having a first and second longitudinal strip laying along the surface of said die holder and a portion extending through said slit and engaging said die parts, a first cam track and cam follower means between said first strip and the die holder, second cam track and cam follower means between said second strip and the die holder, said first and second cam tracks and followers defining diverging paths in the direction of said front face of the die holder, and spring means urging said die actuation device rearwardly from said front face, whereby driving force on the die actuating device against the urge of said spring will part said split die.

References Cited in the file of this patent UNITED STATES PATENTS 356,492 Morrill Ian. 25, 1887 440,255 Austin Nov. 11, 1890 660,121 Parsons Oct. 23, 1900 812,803 Arey Feb. 20, 1906 918,745 Goldschmidt et a1 Apr. 20, 1909 945,012 Bernard Jan. 4,1910 1,419,222 Chadderton et al June 13, 1922 1,457,307 Kerns June 5, 1923 2,715,345 Rozmus Aug. 16, 1955 2,774,262 Sowter Dec. 18, 1956 

